Default issue with Nexus 5 display

Hi ,

I recently bought nexus 5 - 16 GB, and guess what , was installing the apps etc, it was working fine and suddenly the display is gone, cant see any thing at all on teh display, although the device is being detected by the PC, when connected via USB, and it shows the content and folders, I tried quite a few things restart etc, but same , no display. I tried erasing all data from android device manager, even then nothing worked, and mobile never felt down or any physical damaged has not happened, can any one suggest how to debug the issue, i went to LG customer service but, its not in warranty since i bough it from USA and using in India, please help.